and the quality on those is rubbish, forget about using an xbox or ps3 or any decent dvd player with them. also they are pretty big so moutning one behnind a tv is going to push the tv a long way out from the wall
usual approach is to chase a channel in the wall for the cables and replaster, you can leave a bit of conduit in the wall to allow adding of future cables, but at a miniumum would be looking at running 2*hdmi, 1* coax if your tv has a dvb-t tuner, plus an optical if your tv has optical out. possibly even scart if you have old gear that only ues scart to hook up